Burglar-alarm



(No Model.)

' W. EOKERSALL.

BURGLAR ALARM. 7

No. 334,761. Patented Jan. 26,1886.

v, Ht f0 271E? UN TED STATES PATENT FFICE.

WALTER EOKERSALL, OF HYDE PARK, ILLINOIS.

BURGLAR-ALARM.

PECIFICATION forming part of Letters PatentNo. 334,761, dated January26, 1886.

Application filed April 18, 1884. Renewed October 27, 1885. Serial No.181,100. (No model.)

To all whom it may concern:

Be it known that I, WALTER ECKERSALL, a subject of the Queen of GreatBritain, residing at Hyde Park, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Burglar-Alarms, of which the following is a specification, to wit:

This invention relates to an improvement in burglar-alarms; and itconsists in certain peculiarities of the construction and arrangement ofthe same,substantially as will be hereinafter more fully described andclaimed, whereby the door is fastened by the releasing of the alarm.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to'describe itsconstruction and operation, referring to the accompanying drawings, inwhich Figure l is an elevation of a door having my invention attached.Fig. 2 is an edge view of the door partly opened and the stopbolt inengagement, and Fig. 3 is a view of a catch-piece intended for use withthis device upon windows.

A represents a door, and B the frame, of any of the usual and well-knownforms. Upon the door is secured a gong or bell, O, and in close relationthereto an ordinary clockalarm mechanism, 0, having a hammer, c. Thismechanism is so old and well known that it is deemed unnecessary to showit in detail in the drawings. Upon the door, adjacent'to the hammer c,is secured a spring-bolt, D,

having its rear end turned outward, as at (1,

to engage the hammer and hold it stationary. The case d of the bolt isformed with a slot, (1 through which projects a stud, 6, having athumb-nut, e, by which the bolt may be held back when desired.

Upon the door-frame B is securedacasting, f, having a hole, f, in itsouter end,as clearly shown in Fig. 2.

The operation of this deviceis evident from the drawings. During the daythe bolt D is drawn back and secured by the set-nut,thereby holding thehammer from any movement. At night the nut c is loosened, therebyreleasing the bolt, which rests againstthe casting f,or the frame B.Should the door be opened during the night, the slightest movement willcause the bolt to register with the hole f in the stop f, and the.spring (seen in dotted lines in the drawings) throws it forward,effectually bolting the door, and atthe same time releasing the alarm,which notifies the occupants of the house of the attempt to enter.

The device is equally well adapted to windows or other places to beprotected, and in this case the alarm and bolt are placed upon thewindow-frame and the perforated stop plece or catch on the sash. Theform of this stop may be varied at pleasure without interfering with theaction of the device, only requiring a solid portion,against which thebolt normally rests, and an opening into which it is sprung on beingmoved.

Having thus fully described my invention, what I claim as new, anddesire to secure bv Letters Patent, is v 1. A door or window and itsframe, one of which is provided with a clock-alarm mechanism, and a boltadapted when drawn back to engage and'hold the mechanism, and havingmeans for securing it in this position at will, in combination with astop-catch, against which the end of the bolt rests, and provided withan opening into which it may spring on being moved, to secure the dooror window and sound the alarm, substantially as shown and described. 0

2. In a door and window alarm, the door or ing a hammer, c, and boltD,having a set-nut, 6, 1n combination with the frame B, and stop f,having openingf, substantially as and for the purpose set forth.

W. O. MOARTHUR,

CHAS. KRESSMANN.

window A, hell 0, clock mechanism 0, hav-

